Heterocyclic nitrogen compounds



HETEROCYCLIC NITROGEN COMPOUNDS Frederick F. Blicke, Ann Arbor, Mich, assignor to The Regents of the University of Michigan, Ann Arbor, Mich., a corporation of Michigan No Drawing. Application May 26, 1054, Serial No. 432,583

1 Claim. (Cl. 260239) My invention relates to novel chemical compounds having therapeutic value and to salts of the parent compounds. More particularly, my invention relates to novel N,N,N,N-diethyleneand N,N-ethylene-N,l-J-trimethene-diethyliminiurn-polymethylenirninium quaternary hydroxides and to N,N,N,N-diethyleneand N,N -etl1ylene N,N'-trimethylene-morpholiniurn polytnethylenirniniutn quaternary hydroxides, and to the salts of these bases.

The compounds of my invention consist of the novel cations of the formula:

in which Z can be one of the integers 2 or 3, A can be N-diethyliminium or N-morpholiniuin and B can be N- pentamethyleniininiuni, N hexarnethyleniminium, N- (methylhexarnethyleniminium), N heptomethyleniminium or N-octornethylenitninium, associated with an anionic residue to satisfy the valence requirements. The parent compounds, or quaternary hydroxides, of my invention consist of the above divalent cations associated with two hydroxyl ions. The salts of my in vention con sist of the above divalent cations associated with two monovalent anions such as chloride, bromide, benzoate or picrate ions and the like or, alternatively, the divalent cations can be associated with a single anion such as a sulfate, maleate, tartrate, or succinate ion and the like. Other anionic residues such as citrate and the like can also be used by varying the cation-anion ratio to satisfy the valence requirements. e

The salts of the present invention are prepared by reacting the ethylene diethylamine N polymethylenimines which are disclosed in my copending application Serial No. 432,581, filed May 26,1954 with ethylene or trimethylene dihalides. The reaction can be illustrated bythe following equation in which A, B and Z have thesarne significance as in the generic formula above and X represents a halide ion such as chloride or bromide. The parent compounds of my invention, i. e., the quaternary hydroxides, can be pre pared from the above salts'by conventional methods, e. g., treatment of the salt in aqueous solution with silver oxide. The equations below illustrate the complete structural formulae of typical reactants and products.

A mixture of 0.03 mole of ethylene-N-diethylamine- N'hexamethyienimine (B. P. 122l26 C. 14 mm.) and 0.035 mole of 1,2-dibrotnoethane and ml. of isopropyl alcohol was refluxed for about 24 hours, then cooled and filtered. The precipitate recovered was dissolved in a few ml. of water, decolon'zed with activated charcoal, and reprecipitated with isopropyl alcohol. The desired prod- D uct, after drying at C, had a melting point of 296298 C. (decomposition).

The dipicrate was obtained by adding aqueous picric acid to a concentrated aqueous solution of the quaternary dibromide until precipitation ceased. The dipricate was purified by recrystallization f om aqueous acetone and had a melting point of 291-292" C. (decomposition).

EXAMPLE II N,N' ethylene N,N' trimethylene diezhyliminiumoctamethylenfmznium dibromide This product was prepared in accordance with Example I by reacting 1.,2-dibron1oethane with ethylene-N-diethylarnine-N-heptarnethyleneimine (B. P. 129-134" C. 11 mm). The desired product had a melting point of 296298 C. (decomposition). The dipricate had a melting point of 228-230? C. (decomposition).

EXAMPLE TV N,N,N,N dietlzylene aiezfhylimim'lmz octmiretliylem iminium a'ibromide, f

This product was prepared in accordance with Example IH employing ethyIeneN-diethylarnine-N-octamethyleneimine. The desired product had a melting point of 28028l C. (decomposition). The dipricate had melting point of 252-253 C. (decomposition).

EXAMPLE V N,N ethylene N,N' trimethylene diethylimiuizlmhexamethyleniminium dibromz'a'e This product was prepared in accordance withExample II by reacting LZ-dibrornoprbpane with ethylene-N-di- Patented Apr. 24, 1956 ethylamine-N'-hexamethylenimine. The desired product N,N ethylene N,N',- trimethylene diethyliminiumheptamethyleniminium dibromide This product was prepared in accordance with Example V employing ethylene-N-diethylamine-N-heptarnethylenimine. The desired product had a melting point of 282284 C. (decomposition). The dipricate had a melting point of 235-237 (decomposition).

EXAMPLE v11 N,N ethylene N,N trimethylene diethyliminiunw (4-methyl-hexamethyleniminium) dibromide EXAMPLE VIII N,N,N,N' diethylene morpholinium pentamethyle-niminium dibromide The reactants, ethylene-N-morpholine-N-pentamethylenimine (0.03 mole) and 1,2-dibromoethane (0.035 mole) were charged to a reaction vessel together with 75 ml. of isopropyl alcohol and refluxed for about 24 hours. The reaction mixture was cooled and filtered to recover the precipitate. The precipitate was dissolved in a few mls. of water, decolorized with activated charcoal and reprecipitated with isopropyl alcohol. The purified product was dried in air at 110 C. and had a melting point of 296298 C. (decomposition).

The dipicrate was prepared by adding aqueous picric acid toa concentrated aqueous solution of the quaternary dibromide until precipitation ceased. The dipicrate was purified by recrystallization from aqueous acetone to give a pure salt which melted at 292-293" C. (decomposition) EXAMPLE IX N,N',N,N diethylene morpholinium heptamethyleniminium dibromide The procedure of Example VIII was repeated employing ethyleneN-morpholine-N'-heptamethylenimine and 1,2-dibrornoethane to give the product which had a melting point of 29l-292 C. (decomposition). The dipicrate was obtained as above and had a melting point of 274275 C. (decomposition).

EXAMPLE X N,N',N,N diethylene morpholinium octamethyleniminium dibromide The product was formed by the procedure of Example VIII employing ethylene-N-morpholine-N'-octamethylenimine and 1,2-dibromoethane and had a melting point of 267-268 C. (decomposition). The dipicrate had a melting point of 280-281 C. (decomposition).

EXAMPLE XI N,N' ethylene N,N' trimethylene morpholiniumpentamethyleniminium dibromide The product was formed by the procedure of Example VIII reacting ethylene-N-morpholine-N-pentamethylenimine with 1,3-dibromopropane and had a melting point d of 329330 C. (decomposition). The dipicrate obtained had a melting point of 27l273 C. (decomposition).

EXAMPLE XII N,N ethylene N,N' trimethylene morpholiniumhexamethyleniminium dibromide The product was formed as above by the reaction of ethylene-N-rnor'pholine-N-hexamethylenimine with 1,3- dibromopropane and had a melting point of 306-308 C. (decomposition). The dipicrate had a melting point of 244-246" C. (decomposition).

EXAMPL XlII N,N ethylene N,N trimethylene morpholiniumheptamethyleniminium dibromide EXAMPLE XIV N,N' ethylene N,N trimethylene morpholiniumoctamethyleniminium dibromide The product was formed as above by the reaction of ethylene-N-morpl1oline-N-octamethylenimine with 1,3- dibromopropane and had a melting point of 279280 C. (decomposition). The dipicrate had a melting point of 182-184 C. (decomposition).

The various other salts of my new compounds can be prepared by substitution of the anion in accordance with standard procedures. For instance, the dibromides described above can be converted to the corresponding dichlorides or sulfates by treating an aqueous solution of the dibromide with silver oxide, filtering to remove the halide precipitate, and neutralizing the filtrate which comprises an aqueous solution of the corre sponding quaternary hydroxide with hydrochloric or sulfuric acid, respectively. The organic acid salts can be prepared in a like manner. The iodides can be obtained by'mixing warm methanolic solutions of the chloride or bromide with a stoichiometric quantity of potassium iodide in methanol, filtering the precipitated potassium halide, and evaporating the filtrate to obtain the crude salt which may be purified by dissolution in water and precipitation with isopropyl alcohol. In a similar way reaction of a quaternary sulfate dissolved in water with a soluble barium salt such as a nitrate can be used to convert the sulfate to another desired salt.

The bases and salts of the present invention are physiologically active and are characterized, among other things, by their blood pressure lowering properties. The compounds are water soluble and may be administered parenterally or orally.

It is to be understood that the foregoing examples are for illustrative purposes only and are not to be construed as limiting the scope of the invention.

I claim:

The compounds of the formula 2): I-CHI D N E 811101]. H

(EH1) z CHE-Cg:

in which Z is an integer from 2 to 3; D is a group which when taken together with the N atom to which it is attached represents a radical selected from the group consisting of diethyliminium and morpholinium; and E is a radical selected from the group consisting of methylene, ethylene, propylene and butylene; with the proviso that when E is ethylene the ring containing E can be substituted with a methyl group.

(References on following page) .nd a.

References Cited in the file of this patent UNITED STATES PATENTS FOREIGN PATENTS Great Britain Dec. 12, 1935 6 OTHER REFERENCES Fulton et a1.: Proc. Roy. Soc. (London), v01. 137B,

Libman et al.: J. Chem. Soc.

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